LCD Backlight Module Flicker Control via Boost Voltage Timing
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Solution Overview
Problem
Rapid shutdown and startup of LCD backlight modules lead to flickering phenomena due to retained electric charges in electrolytic capacitors, causing unstable light sources and reduced display quality.
Innovation Solution
An LCD backlight module with a control module that manages the boost module to maintain voltage output after the backlight source is turned off, determining the duration since shutdown to either decrease or maintain voltage, preventing abrupt changes that cause flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the backlight source is rapidly shut down and started up, then the response time is reduced, but the light source stability deteriorates causing flickering phenomenon
Solution Approach 1:
The control module extends the voltage output time of the boost module beyond the normal shutdown time. When a shutdown signal is received, the control module determines whether to extend the voltage output based on timing information, ensuring that electrolytic capacitors have sufficient time to discharge their electric charges before the backlight source is completely turned off. This preliminary action prevents residual charges from causing flickering during rapid startup.
Solution Approach 2:
The control module uses timing feedback to determine whether to extend the voltage output time. By comparing the time since the last shutdown signal with a predetermined threshold, the control module dynamically adjusts the boost module's voltage output duration. This feedback mechanism ensures that the voltage is extended only when necessary, preventing flickering during rapid shutdown/startup while avoiding unnecessary extension during normal operation.
2Reliability
If the voltage output time is extended after backlight shutdown, then the flickering phenomenon is prevented, but the energy consumption increases
Solution Approach 1:
The control module applies partial extension of voltage output only when necessary. Instead of always extending the voltage output time, the control module selectively extends it based on whether a rapid shutdown/startup situation is detected. This partial action approach prevents flickering only when needed, avoiding unnecessary energy consumption during normal shutdown operations.
Solution Approach 2:
The control module dynamically changes the voltage output time parameter based on operational conditions. By adjusting the duration of voltage output from the boost module according to the timing of shutdown signals and the state of electrolytic capacitors, the system optimizes the balance between preventing flickering and minimizing energy consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents flickering during rapid shutdown and startup, enhancing display quality by ensuring a stable light source and extending the useful life of the LCD backlight module.
Implementation Method 1
a boost module, utilized to output a voltage to the backlight source
Data Source
AI summary
The present invention discloses an LCD backlight module, which includes a backlight source and a backlight source control device, the backlight source control device comprising: a first switch; a boost module; a control module, utilized to control the first switch, so that the backlight source is switched on off under the control of the control module, and utilized to control the boost module, so that the boost module keeps outputting the voltage after the backlight source is turned off by the first switch.